Moreover, since the \(\pi /2\)  (zero and \(\pi \) ) modes of \({\cal U}_{1/2}\) 
are inherited from the zero (\(\pi \) ) modes of the parent model \({\cal U}\) ,
their numbers are determined by the winding numbers \((\nu _{0},\nu _{\pi })\) 
of the second model in Sec.  [1]} through
the bulk-corner correspondence relations
\(n_{\pi /2}=4|\nu _{0}|,\qquad n_{0}=n_{\pi }=4|\nu _{\pi }|.\) 
